Why is it hard? I have some experience with demographic databases. I take it as a given that Facebook, NSA, whomever, have uniquely identified every person, li

Why is it hard? I have some experience with demographic databases. I take it as a given that Facebook, NSA, whomever, have uniquely identified every person, living and dead. I just don't understand how or why fake accounts are created. Smaller outfits like metafilter need some kind of gatekeeper. Like require nominal fee or scan of ID or verification photo.